Isotopic Pattern Recognition for Mass Spectrometry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mass spectrometry techniques face challenges in accurately determining the abundance of elements or element combinations with isotopic variants due to limitations in resolving fine isotopic structures, particularly in complex samples, where high resolution is required to distinguish between peaks from different sources with the same nominal mass.
Innovation Solution
A method that involves identifying isotopic mass spectral patterns, comparing them with high-resolution mass spectral data, and determining abundance based on intensity measurements of peak groups matching the patterns, allowing for precise identification of elemental compositions without requiring complete molecular analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution mass spectrometry is used to separate fine isotopic structure, then measurement precision of isotopic patterns is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies partial action by focusing the mass spectrometry analysis only on the specific isotopic patterns relevant to the target element or element combination, rather than analyzing the entire mass spectrum with maximum resolution. The system determines a minimum resolution requirement based on the specific isotopic pattern being sought, and only achieves that level of resolution, not necessarily the maximum capability of the instrument. This reduces unnecessary complexity while maintaining sufficient measurement precision for the specific analytical goal.
2Reliability
If high resolution mass spectrometry is used to distinguish peaks from different sources, then reliability of elemental composition identification is improved, but analysis time and productivity decrease
Solution Approach 1:
The patent applies preliminary action by first calculating the expected isotopic pattern for the target element or element combination, including the specific mass-to-charge ratio differences and relative abundances of isotopic variants. This theoretical pattern is prepared in advance and used as a reference template. During actual analysis, the system only needs to search for and compare against this pre-defined pattern, significantly reducing the computational and analytical time required while maintaining high reliability in identification.
Solution Approach 2:
The patent applies local quality by focusing high-resolution analysis only on the specific mass-to-charge ratio regions where the isotopic pattern of the target element is expected to appear. Rather than uniformly applying high resolution across the entire mass spectrum, the system concentrates analytical resources on the relevant local regions, improving reliability for the specific elemental identification while reducing overall analysis time and increasing productivity.
3Measurement precision
If complete molecular mass analysis is performed to identify elemental composition, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies the extraction principle by isolating and analyzing only the isotopic pattern information relevant to the specific element or element combination of interest, rather than performing a complete molecular mass analysis of the entire compound. The system extracts the characteristic isotopic fingerprint (mass-to-charge ratio differences and relative abundances) and uses this extracted information alone to determine elemental composition, eliminating the time-consuming steps of complete molecular characterization while maintaining measurement precision for the elemental identification.
Data Source
AI summary
A measure of abundance is determined for an element or element combination within a sample, the element or element combination having at least one isotopic variant. An isotopic mass spectral pattern is identified for the element or element combination that indicates an expected abundance and expected mass-to-charge ratio difference for each isotopic variant. These are identified relative to the respective abundance and mass-to-charge ratio of a principal isotope. The isotopic mass spectral pattern is compared with mass spectral data from a molecular mass analysis of the sample to identify peak groups, each matching the isotopic mass spectral pattern. A measure of abundance is determined for the element or element combination as a function of the intensity measurement of one or more peaks from each of the identified peak groups.